One Laptop per Child Connectivity & Collaboration May 20, 2008 One Laptop per Child

Principles Learning happens by interacting as much as it happens by teaching => child2child as important as child2internet

Learning happens by interacting as much as it happens by teaching => child2child as important as child2internet

Our approach Standard WiFi network adapter Mesh Networking built on top of that

Standard WiFi network adapter

Mesh Networking built on top of that

Our approach Collaboration software (middleware, applications and UI)

Collaboration software (middleware, applications and UI)

OLPC Mesh Design Goals low power consumption as transparent as possible to applications based on standards Connectivity/Range

low power consumption

as transparent as possible to applications

based on standards

Connectivity/Range

XO Networking Architecture AMD LX700 CPU Marvell 8388 SoC Radio USB 2.0 Bus Layer 2: Frames Layer 3: Packets

OLPC Collaboration Middleware Application “Activity” Telepathy/Presence API Telepathy/Presence Gabble Salut 802.11S 802.11B/G Ethernet Middleware External Jabber Server Local Mesh Network

Mesh Network Gateways (portals) Mesh portals connect laptops to servers and an Internet connection

Mesh portals connect laptops to servers and an Internet connection

Collaboration The ability of students to share documents and directly interact with one another Requires a network connection between the student’s laptops: Traditional Wireless (802.11b/g) Mesh Wireless (802.11s) Possibly long distance

The ability of students to share documents and directly interact with one another

Requires a network connection between the student’s laptops:

Traditional Wireless (802.11b/g)

Mesh Wireless (802.11s)

Possibly long distance

Mesh vs. WiFi The wireless mesh (802.11s) is an extension of traditional WiFi (802.11b/g) Both use the same radio spectrum 3 usable channels around 2.4GHz Wireless mesh devices (the laptop) interoperate with WiFi devices Mesh does not replace WiFi (it extends it) WiFi should be used at Schools

The wireless mesh (802.11s) is an extension of traditional WiFi (802.11b/g)

Both use the same radio spectrum

3 usable channels around 2.4GHz

Wireless mesh devices (the laptop) interoperate with WiFi devices

Mesh does not replace WiFi (it extends it)

WiFi should be used at Schools

School WiFi One or more WiFi (802.11b/g) access points, connected to a central switch and school server

One or more WiFi (802.11b/g) access points, connected to a central switch and school server

Collaboration Presence is the ability of students to “see” if other laptops are connected to the network Collaboration is the ability of students to share activities and documents they’ve created. Presence and Collaboration work over any network, not just a Mesh network

Presence is the ability of students to “see” if other laptops are connected to the network

Collaboration is the ability of students to share activities and documents they’ve created.

Presence and Collaboration work over any network, not just a Mesh network

Cerebro

Do it yourself

Active Antennas